Hello community, this is my first post to the forums. I've been finding solutions here for many years, and am surprised that I seem to be the first person to experience this issue. My apologies in advance if this has been asked and answered elsewhere.

I recently upgrade to CentOS 7.6 from 7.5 and am seeing that my laptop keyboard does not work after Gnome starts. The keyboard itself is fine; I'm able to even key in my LUKS password to decrypt and mount my OS partitions.

I thought that if I was able to downgrade xorg-x11-drv-evdev and boot off the older kernel, that might workaround the issue for me. But as I mentioned above, I am unable to downgrade ... thus why I was inquiring about the process to uninstall or downgrade to CentOS packages from older releases.

Sure. It's just that the kernel was one of the 2 most likely things for it to be.

Can you post your /var/log/Xorg.0.log to see if there is anything there that might show the problem.

You could try running yum --enablerepo=C7.5.1804-updates downgrade xorg\* though that's probably a very large set of packages. Save a copy of the log file above and if it works after downgrade, compare the two of them and see if anything stands out.

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You could try running yum --enablerepo=C7.5.1804-updates downgrade xorg\* though that's probably a very large set of packages. Save a copy of the log file above and if it works after downgrade, compare the two of them and see if anything stands out.

It looks like many of the packages were not found. Maybe I'm overlooking something.

Please note that I failed to follow your instructions explicitly. I downgraded the found packages in the below list before reviewing the Xorg.0.log. Let me know if you want me to upgrade back to the point I was at originally and replay the steps.

[root@decheser ~]# yum --enablerepo=C7.5.1804-updates downgrade xorg\*
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: linux.cc.lehigh.edu
* elrepo: dfw.mirror.rackspace.com
* epel: archive.linux.duke.edu
* extras: centos.host-engine.com
* nux-dextop: li.nux.ro
* remi-safe: fr2.rpmfind.net
* updates: centos.den.host-engine.com
No Match for available package: xorg-sgml-doctools-1.10-5.el7.noarch
No Match for available package: xorg-x11-apps-7.7-7.el7.x86_64
No Match for available package: xorg-x11-docs-1.6-7.el7.noarch
No Match for available package: xorg-x11-drv-evdev-devel-2.10.6-1.el7.i686
No Match for available package: xorg-x11-drv-evdev-devel-2.10.6-1.el7.x86_64
No Match for available package: xorg-x11-drv-intel-devel-2.99.917-28.20180530.el7.i686
No Match for available package: xorg-x11-drv-intel-devel-2.99.917-28.20180530.el7.x86_64
No Match for available package: xorg-x11-drv-joystick-1.6.2-1.el7.elrepo.x86_64
No Match for available package: xorg-x11-drv-keyboard-1.9.0-1.el7.x86_64
No Match for available package: xorg-x11-drv-libinput-devel-0.27.1-2.el7.i686
No Match for available package: xorg-x11-drv-libinput-devel-0.27.1-2.el7.x86_64
No Match for available package: xorg-x11-drv-mouse-devel-1.9.2-2.el7.i686
No Match for available package: xorg-x11-drv-mouse-devel-1.9.2-2.el7.x86_64
No Match for available package: xorg-x11-drv-openchrome-0.5.0-3.el7.1.i686
No Match for available package: xorg-x11-drv-openchrome-0.5.0-3.el7.1.x86_64
No Match for available package: xorg-x11-drv-openchrome-devel-0.5.0-3.el7.1.i686
No Match for available package: xorg-x11-drv-openchrome-devel-0.5.0-3.el7.1.x86_64
No Match for available package: xorg-x11-drv-wacom-devel-0.34.2-5.el7.i686
No Match for available package: xorg-x11-drv-wacom-devel-0.34.2-5.el7.x86_64
No Match for available package: xorg-x11-fonts-100dpi-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-75dpi-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-ISO8859-1-100dpi-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-ISO8859-1-75dpi-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-ISO8859-14-100dpi-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-ISO8859-14-75dpi-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-ISO8859-15-100dpi-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-ISO8859-15-75dpi-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-ISO8859-2-100dpi-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-ISO8859-2-75dpi-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-ISO8859-9-100dpi-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-ISO8859-9-75dpi-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-cyrillic-7.5-9.el7.noarch
No Match for available package: xorg-x11-fonts-ethiopic-7.5-9.el7.noarch
No Match for available package: xorg-x11-proto-devel-2018.4-1.el7.noarch
No Match for available package: xorg-x11-resutils-7.5-8.el7.nux.x86_64
No Match for available package: xorg-x11-resutils-debuginfo-7.5-8.el7.nux.x86_64
No Match for available package: xorg-x11-server-Xdmx-1.19.5-5.1.el7_5.x86_64
No Match for available package: xorg-x11-server-Xephyr-1.19.5-5.1.el7_5.x86_64
No Match for available package: xorg-x11-server-Xnest-1.19.5-5.1.el7_5.x86_64
No Match for available package: xorg-x11-server-Xspice-0.1.5-4.el7.1.x86_64
No Match for available package: xorg-x11-server-Xvfb-1.19.5-5.1.el7_5.x86_64
No Match for available package: xorg-x11-server-Xwayland-1.19.5-5.1.el7_5.x86_64
No Match for available package: xorg-x11-server-devel-1.19.5-5.1.el7_5.i686
No Match for available package: xorg-x11-server-devel-1.19.5-5.1.el7_5.x86_64
No Match for available package: xorg-x11-server-source-1.19.5-5.1.el7_5.noarch
No Match for available package: xorg-x11-util-macros-1.19.0-3.el7.noarch
No Match for available package: xorg-x11-xbitmaps-1.1.1-6.el7.noarch
No Match for available package: xorg-x11-xinit-session-1.3.4-2.el7.x86_64
No Match for available package: xorg-x11-xkb-extras-7.7-14.el7.x86_64
No Match for available package: xorg-x11-xkb-utils-devel-7.7-14.el7.i686
No Match for available package: xors
No Match for available package: xorg-x11-xtrans-devel-1.3.5-1.el7.noarch
No Match for available package: xorgxrdp-0.2.9-1.el7.x86_64
Resolving Dependencies
--> Running transaction check
---> Package xorg-x11-drv-ati.x86_64 0:18.0.1-1.el7 will be a downgrade
---> Package xorg-x11-drv-ati.x86_64 0:18.1.0-1.el7_6 will be erased
---> Package xorg-x11-drv-wacom.x86_64 0:0.34.2-5.el7 will be a downgrade
---> Package xorg-x11-drv-wacom.x86_64 0:0.36.1-1.el7 will be erased
---> Package xorg-x11-server-Xorg.x86_64 0:1.20.1-5.1.el7 will be a downgrade
---> Package xorg-x11-server-Xorg.x86_64 0:1.20.1-5.2.el7_6 will be erased
---> Package xorg-x11-server-common.x86_64 0:1.20.1-5.1.el7 will be a downgrade
---> Package xorg-x11-server-common.x86_64 0:1.20.1-5.2.el7_6 will be erased
--> Finished Dependency Resolution